I just found out that my old 2 in 1 out muffler don't bolt up on a 3.2 Carrera, and before you point it out the obvious, I have headers on it

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I just expected the muffler to bolt right on, but the muffler bracket is different and the biggest difference seams to be the engine mount that is "bigger".
Is there a known fix, preferably quick and cheep, for this, or do I need a new muffler?